Subsection combination construction method for temporary supports of main arch steel beams crossing riverway

Abstract

The invention discloses a segmented combination construction method for a temporary support of a main arch steel beam crossing a river channel, and relates to the technical field of bridge construction. Comprising steel beam temporary support construction, main arch temporary support construction and auxiliary arch temporary support construction, specifically, the steel beam temporary support construction adopts a steel pipe pile support form, and supports are arranged in groups in the bridge direction according to the design of steel beam straining beams and longitudinal and transverse beams in the positions of steel pipe piles; longitudinal distribution beams are arranged on the steel pipe piles at the top ends of the middle cross beams; the main arch temporary support construction comprises underwater support construction and overwater support construction; transverse connection structures are arranged between the main arch temporary supports and the steel beams and between the main arch temporary supports and the auxiliary arch temporary supports. The main arch temporary support is good in stability under the wind load effect, the construction accuracy can be guaranteed through the segmented installation mode, and the construction mode is more convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a segmented assembly construction method for a temporary support for a main arch steel beam spanning a river channel. Background Art

[0002] A bridge across a river is a structure built above a river to facilitate the passage of people on both sides of the river.

[0003] When constructing a bridge across a river, it is necessary to build a bridge construction scaffold. Due to the influence of complex environmental conditions such as typhoons and floods at the construction site, the on-site lifting environment is complex, which brings great difficulties to the construction of the bridge construction scaffold.

[0004] Based on the problems existing in the above-mentioned prior art, it is necessary to design a segmented combination construction method for temporary supports of main arch steel beams crossing the river channel with better wind resistance and stable overall structure. Summary of the Invention

[0005] The main purpose of the present invention is to provide a segmented assembly construction method for a temporary support of a main arch steel beam across a river channel, so as to solve the problems existing in the prior art.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for constructing a temporary support for a main arch steel beam across a river channel in sections, comprising construction of a temporary support for the steel beam, a temporary support for the main arch, and a temporary support for the auxiliary arch:

[0008] Temporary steel beam supports are constructed using steel pipe piles. The steel pipe piles are arranged in groups along the bridge direction according to the design of the steel beam tie beams, longitudinal and transverse beams. Transverse distribution beams are set on the top of the steel pipe piles of the steel beam tie beams, and longitudinal distribution beams are set on the top of the steel pipe piles at the top of the middle transverse beam.

[0009] The construction of temporary support for the main arch includes underwater support construction and above-water support construction;

[0010] Structural transverse connections are set between the main arch temporary support and the steel beam, and between the main arch temporary support and the auxiliary arch temporary support.

[0011] Furthermore, the underwater support construction sets rock-embedded piles in the underwater part and pours concrete into the rock-embedded piles. The concrete is poured to the riverbed position. The water support construction is set up in time according to the installation progress of the arch rib segment.

[0012] Furthermore, the position and dimensions of the longitudinal and transverse beams of the steel pipe piles correspond to the tie beams, with a spacing of 6.7 m.

[0013] Furthermore, the temporary support for the main arch adopts a steel pipe pile support in the pile foundation part at and below the elevation, the columns are made of steel pipes, and the temporary support for the main arch adopts rock-embedded piles. The depth of the rock-embedded piles embedded in the moderately weathered rock is not less than 3 times the diameter of the steel pipe.

[0014] Furthermore, the temporary support for the main arch adopts steel pipe lattice columns in the part above the elevation. The columns of the temporary support for the main arch are made of steel pipes. The longitudinal and transverse spacing of the columns are both 4m. The steel pipe piles are connected by a steel pipe connection system. Distribution beams are set at the elevation position and the top of the temporary support for the main arch.

[0015] Furthermore, transverse connecting trusses are provided between adjacent main arch temporary supports.

[0016] Furthermore, the columns of the main arch temporary support are connected by providing a ring plate at the end of the column of the lower temporary support.

[0017] Furthermore, the construction of the temporary support for the auxiliary arch adopts assembled lattice support, and a distribution beam is provided at the contact surface between the temporary support for the auxiliary arch and the steel beam of the bridge deck.

[0018] Furthermore, the assembled lattice support includes vertical poles, diagonal braces and a top support plate, and a positioning frame is provided on the upper portion of the top support plate according to the segmented positions of the secondary arch segments.

[0019] Furthermore, adjacent temporary supports for the secondary arches are provided with transverse and longitudinal lattice trusses.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The setting of transverse connection can increase the overall stability between the main arch temporary support and the steel beam, and between the main arch temporary support and the secondary arch temporary support, increase the stability of the main arch temporary support under wind load, and ensure construction safety;

[0022] The main bridge's steel beams and arch ribs are hoisted and installed in sections, which are subdivided into the steps of temporary support construction for steel beams, temporary support construction for main arches and temporary support construction for auxiliary arches. The section-by-section installation can ensure construction accuracy and is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall arrangement of the temporary support of the present invention.

[0024] Figure 2 It is a plan view of the temporary support for steel beams of the present invention.

[0025] Figure 3 This is a vertical view of the temporary support for steel beams of the present invention.

[0026] Figure 4 It is a side view of the temporary support for steel beams of the present invention.

[0027] Figure 5 It is a side view of the steel beam temporary support at the pier end steel beam segment support of the present invention.

[0028] Figure 6 This is an elevation view of the navigation hole truss structure of the steel beam temporary support of the present invention.

[0029] Figure 7 It is a schematic diagram of the main arch temporary support segment positioning cradle of the present invention.

[0030] Figure 8 Elevation view of the temporary support for the main arch of the present invention.

[0031] Figure 9 This is a schematic diagram of the steel pipe pile connection of the main arch temporary support of the present invention.

[0032] Figure 10 It is a schematic diagram of the segmented structure of the main arch temporary support of the present invention.

[0033] Figure 11 It is a plan view of the auxiliary arch temporary support of the present invention.

[0034] Figure 12 It is an elevation view of the auxiliary arch temporary support of the present invention.

[0035] Figure 13 for Figure 12 Schematic diagram of AA and BB sections.

[0036] Figure 14 This is a vertical elevation view of the transverse connection between the temporary support for the main arch and the steel beam of the present invention.

[0037] Figure 15 It is a plan view of the transverse connection between the temporary support of the main arch and the steel beam of the present invention.

[0038] Figure 16 It is a horizontal connection plan view between the main arch temporary support and the auxiliary arch temporary support of the present invention.

[0039] Figure 17 This is a vertical elevation view of the transverse connection between the main arch temporary support and the secondary arch temporary support of the present invention.

[0040] Among them, 100-temporary support for the main arch; 200-temporary support for the secondary arch; 1-navigation hole; 2-rock-embedded piles; 3-temporary anti-collision piers; 4-floating anchor points; 5-steel pipe piles; 6-transverse distribution beams; 7-longitudinal distribution beams; 8-navigation hole truss structure; 9-transverse connection trusses; 10-horizontal connection; 11-steel pipe connection system; 12-middle crossbeam; 13-tie beam segment; 14-cantilever segment; 15-upper chord; 16-lower chord; 17-web members; 18-transverse connection; 19-underwater support construction; 20-above-water support construction; 21-distribution beam; 22-positioning cradle. DETAILED DESCRIPTION

[0041] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0042] Example

[0043] Combine Figure 1-17 The present invention provides a method for the segmented assembly construction of temporary supports for main arch steel beams across a river channel. The main bridge steel beams and arch ribs are hoisted and installed in segments using the "support method", including the construction of temporary supports for steel beams, temporary supports for main arches 100, and temporary supports for secondary arches 200. The temporary supports for steel beams and temporary supports for main arches 100 are located in the water.

[0044] The upper structure of the main bridge adopts the "beam first, arch later, and in-situ assembly" technology. The steel beams are erected from the two sides to the middle of the span. The middle of the steel beam is the central cross beam 12. The two sides of the central cross beam 12 are connected in sequence with the tie beam segment 13 and the cantilever arm segment 14. The central cross beam 12 is composed of multiple central cross beam segments. After the steel beams are erected and welded, the arch ribs are installed symmetrically. The secondary arch is installed first, and then the main arch is installed. After each main arch section is installed, the wind bracing of the section is installed before the subsequent sections are installed to ensure the stability of the installation.

[0045] The temporary support has reserved a 20m floating crane navigation hole 1, and a navigation hole truss structure 8 is set at the navigation hole 1. Two adjacent navigation hole truss structures 8 are connected by a horizontal connection 10, and the temporary support is also equipped with a temporary anti-collision pier 3 and a floating crane anchor point 4. The temporary anti-collision pier is formed by combining 3 steel pipe piles 5, and the floating crane anchor point 4 is located on the surrounding side of the temporary support.

[0046] The navigation hole truss structure 8 includes an upper chord 15 , a lower chord 16 and a web 17 . The upper chord 15 and the lower chord 16 are both supported by steel pipe piles 5 , and the web 17 is connected between the upper chord 15 and the lower chord 16 .

[0047] The temporary support for the steel beam is constructed in the form of a steel pipe pile support. The steel pipe pile 5 columns are made of Φ630×8mm steel pipes. The positions of the steel pipe piles 5 are arranged in groups along the bridge direction according to the design of the steel beam tie beams and longitudinal and transverse beams. In this embodiment, three groups of supports are arranged, and steel pipe piles 5 are appropriately added in some parts to ensure that all steel beams are covered. A transverse distribution beam 6 is set on the top of the steel pipe piles of the steel beam tie beams, and a longitudinal distribution beam 7 is set on the top of the steel pipe piles 5 at the top of the middle transverse beam. Adjacent longitudinal distribution beams 7 on the temporary support for the steel beam are connected with a horizontal connection 10, which can increase the overall stability of the structure.

[0048] The steel pipe pile brackets are constructed by combining four steel pipes to form a single unit, ensuring the overall stability of the steel pipe piles 5. The steel pipe pile tie beams are 2.75 x 4.0 m in size, spaced at intervals of 8.25 m, 11 m, and 10.2 m along the bridge, and disconnected at navigation channel 1.

[0049] The steel pipe piles are connected by a Φ351×8mm steel pipe connection system 11. The foundations of the steel beam tie beam, the main arch temporary support 100, and the navigation hole 1 crossbeam support are considered as rock-embedded piles 2. The bottom of the rock-embedded piles 2 is embedded in the moderately weathered rock at a depth of not less than 3 times the diameter of the steel pipe, which is 3m (the highest support of the main arch is 5m). Concrete is poured into the rock-embedded piles 2, and the concrete is poured to the riverbed to meet the load-bearing requirements of the steel pipe piles.

[0050] The foundations for the longitudinal and transverse beams are controlled by driving piles into the gravel layer at least 3m deep until the steel pipe piles 5 stop sinking. 2HM588×300 steel sections are installed on top of the steel pipe piles of the steel tie beams as transverse distribution beams 6, and double HN900x300 steel sections are installed on top of the center crossbeam piles as longitudinal distribution beams 7.

[0051] The position and dimensions of the longitudinal and transverse beams of the steel pipe piles correspond to the tie beams, with a spacing of 6.7m.

[0052] The construction of the temporary support 100 for the main arch includes underwater support construction 19 and above-water support construction 20. During the underwater support construction 19, rock-embedded piles 2 are set in the underwater part. The bottom of the rock-embedded piles 2 is embedded in the moderately weathered rock by no less than 3 times the diameter of the steel pipe. Concrete is poured into the rock-embedded piles. The concrete is poured to the riverbed position to meet the stress requirements of the steel pipe piles. The above-water support construction 20 is set in a timely manner according to the installation progress of the arch rib segments.

[0053] A structural transverse connection 18 is set between the main arch temporary support 100 and the steel beam, and between the main arch temporary support 100 and the secondary arch temporary support 200. The transverse connection 18 can further improve the overall stability of the structure and increase the stability of the main arch temporary support under wind load; the top of the main arch temporary support 100 is connected to the upper structure through a positioning tire frame 22.

[0054] The main arch temporary support 100 adopts a steel pipe pile support in the pile foundation part at and below the elevation, and the columns are made of steel pipes. The main arch temporary support adopts rock-embedded piles, and the depth of the rock-embedded piles embedded in the moderately weathered rock is not less than 3 times the diameter of the steel pipe.

[0055] The main arch temporary support 100 adopts steel pipe lattice columns in the part above the elevation. The columns of the main arch temporary support 100 are made of steel pipes. The longitudinal and transverse spacing of the columns are both 4m. The steel pipe piles are connected by a steel pipe connection system. Distribution beams 21 are set at the elevation position and the top of the main arch temporary support 100.

[0056] As an optimization, a transverse connecting truss 9 is set between the adjacent segments of the main arch temporary support 100 to make the overall structure of the main arch temporary support 100 more stable; the columns of the main arch temporary support 100 are connected by setting a ring plate at the end of the column of the lower section temporary support, which is convenient for connection and can reduce the difficulty of construction.

[0057] The construction of the auxiliary arch temporary support 200 adopts assembled lattice support, and a distribution beam 21 is provided on the contact surface between the auxiliary arch temporary support 200 and the bridge deck steel beam.

[0058] The assembled lattice support includes vertical poles, diagonal braces and supporting top plates. By arranging multiple diagonal braces between the vertical poles, the diagonal braces and the vertical poles cooperate to fix the supporting top plates, thereby achieving stable support of the secondary arch temporary bracket 200. A positioning frame is provided on the upper part of the supporting top plate according to the segmented position of the secondary arch, which facilitates positioning and makes the positioning support effect more stable.

[0059] Adjacent auxiliary arch temporary supports are provided with transverse and longitudinal lattice trusses to form a stable frame structure, which can further improve the supporting stability of the auxiliary arch temporary support 200.

[0060] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for constructing a temporary support for a main arch steel beam across a river in a segmented manner, characterized in that: Including the construction of temporary supports for steel beams, temporary supports for main arches and temporary supports for auxiliary arches: Temporary steel beam supports are constructed using steel pipe piles. The positions of the steel pipe piles are arranged in groups along the bridge direction according to the design of the steel beam tie beams, longitudinal and transverse beams. Transverse distribution beams are set on the top of the steel pipe piles of the steel beam tie beams, and longitudinal distribution beams are set on the top of the steel pipe piles at the top of the middle transverse beam. The construction of temporary support for the main arch includes underwater support construction and above-water support construction; Structural transverse connections are set between the main arch temporary support and the steel beam, and between the main arch temporary support and the auxiliary arch temporary support.

2. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 1, characterized in that: The underwater support construction sets rock-embedded piles in the underwater part and pours concrete into the rock-embedded piles until the concrete reaches the riverbed. The above-water support construction is set up in a timely manner according to the installation progress of the arch rib segments.

3. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 1, characterized in that: The position and dimensions of the longitudinal and transverse beams of the steel pipe piles correspond to the tie beams, with a spacing of 6.7m.

4. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 1, characterized in that: The temporary support for the main arch adopts steel pipe pile support at the elevation and below the pile foundation part, the columns are made of steel pipes, and the temporary support for the main arch adopts rock-embedded piles. The depth of the rock-embedded piles embedded in the moderately weathered rock is not less than 3 times the diameter of the steel pipe.

5. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 1, characterized in that: The temporary support for the main arch adopts steel pipe lattice columns in the part above the elevation. The columns of the temporary support for the main arch are made of steel pipes. The longitudinal and transverse spacing of the columns are both 4m. The steel pipe piles are connected by a steel pipe connection system. Distribution beams are set at the elevation position and the top of the temporary support for the main arch.

6. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 5, characterized in that: Transverse connecting trusses are set between adjacent main arch temporary supports.

7. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 5, characterized in that: The columns of the main arch temporary support are connected by setting a ring plate at the end of the column of the lower section temporary support.

8. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 1, characterized in that: The construction of the temporary support for the auxiliary arch adopts assembled lattice support, and a distribution beam is set at the contact surface between the temporary support for the auxiliary arch and the bridge deck steel beam.

9. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 8, characterized in that: The assembled lattice support includes vertical poles, diagonal braces and a top support plate, and a positioning frame is provided on the upper part of the top support plate according to the segmented position of the secondary arch segment.

10. The method for constructing a temporary support for a main arch steel beam across a river channel by segmented assembly as claimed in claim 9, characterized in that: The adjacent temporary supports for the secondary arches are provided with transverse and longitudinal lattice trusses.

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